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1981 Honda CB650C Custom Cylinder-Head Valves & Seals

The 1981 CB650C cylinder-head selection separates intake valves, exhaust valves and stem seals. Have the head assessed before deciding what to replace. A seal set addresses a different wear point from a valve, and the intake and exhaust references must stay distinct.

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Honda CB650 CB650C CB650SC exhaust valve 14721-426-003

1979-82 Honda CB650 / CB650C / CB650SC Exhaust Valve ~ Replaces 14721-426-003

$24.95 USD
73-0980
Replace your exhaust valve with this Exhaust Valve, replacing OEM #14721-426-003. Made in Japan.Key Features• Exhaust valve• Replaces OEM #14721-426-003• Made in JapanFitment /...
Honda CB650 CB650C CB650SC intake valve 14711-426-003

1979-82 Honda CB650 / CB650C / CB650SC Intake Valve ~ Replaces 14711-426-003

$17.57 USD
73-0979
Replace your intake valve with this Intake Valve, replacing OEM #14711-426-003. Made in Japan.Key Features• Intake valve• Replaces OEM #14711-426-003• Made in JapanFitment /...
Honda CB650 CB550 CB500 CB400 CB350 valve stem seals 12209-333-005

Honda CB Valve Stem Seals ~ Replaces 12209-333-005

$2.95 USD
73-0871
Replace your valve stem seals with this Valve Stem Seal, replacing OEM #12209-333-005.Sold each, order the quantity you require.Key Features• Valve stem seal• Replaces...
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Honda CB650 CB550 performance kibblewhite valve stem seal set 12209-333-005

Honda CB High Performance Kibblewhite Valve Stem Seal Set ~ Replaces 12209-333-005

$49.95 USD
12-0083
Fit premium Viton valve stem seals with this Kibblewhite 100% Viton Valve Stem Seal Set of 8, replacing OEM #12209-333-005. Made in the USA....
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1981 Honda CB650C Custom · Cylinder-Head Valves & Seals Buying guide

Order cylinder-head parts by position and condition

The intake valve references 14711-426-003 and the exhaust valve 14721-426-003. The Kibblewhite set adds eight Viton stem seals. Use those identities to build a repair order after checking the head’s serviceable condition.

Parts to consider

1979-82 Honda CB650 / CB650C / CB650SC Intake Valve ~ Replaces 14711-426-003 Intake valveOne Japanese-made intake valve replacing reference 14711-426-003.View part 1979-82 Honda CB650 / CB650C / CB650SC Exhaust Valve ~ Replaces 14721-426-003 Exhaust valveOne Japanese-made exhaust valve replacing reference 14721-426-003.View part Honda CB High Performance Kibblewhite Valve Stem Seal Set ~ Replaces 12209-333-005 Kibblewhite Viton seal setEight valve stem seals made from 100% Viton, replacing reference 12209-333-005.View part

Confirm which valve is needed

The two featured valves share the CB650C application but have different references and positions. Maintain a clear record of the removed parts and have the cylinder head inspected before choosing replacements. A matching model listing cannot replace the measurements needed for head work. Each valve is sold individually; four intake valves and four exhaust valves replace all eight positions.

Choose the stem-seal package clearly

The Kibblewhite package contains eight 100% Viton seals referencing 12209-333-005. That verified quantity makes it possible to compare the set with other repair packages. Do not infer a different count from a product handle or a generic engine-size description.

Cylinder-Head Valves & Seals questions

What else should be checked when a valve is replaced?

Inspect the valve seat, spring, retainer and keepers; for an exhaust valve, also check installed height. Have the seat machined as needed, then set cam timing and valve clearance to Honda specifications after assembly.

What material are the selected stem seals?

The eight-piece Kibblewhite set is specified as 100% Viton. Choose it on that confirmed material and package description without assuming an unverified performance gain.

Does replacing seals remove the need for guide inspection?

Measure valve-stem-to-guide clearance and have excessive guide wear corrected. New valves or stem seals do not establish that the guides are serviceable.

Not sure which part you need?

Send your model and year, plus photos of your existing part and any changes to the original setup.

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